In this article we presented possibility of heart rate and blood oxygenation measurements by classic displacement optical fiber sensor in reflection mode. Based on numerical analysis of sensor head characteristics the optimal construction was developed. Three LED diodes at the wavelengths of 530nm (green), 650nm (red) and 850nm (infrared) were used for determine heart rate and saturation of blood during “in vivo” measurements. Developed sensor head allows noninvasive and continuously monitoring of blood parameters.